| ITF Romania F3 | 2017/06/15 07:00 | Frunza, Nicolae v Onishi, Ken | 6-4,6-1 |
| ITF Romania F3 | 2017/06/14 07:00 | Maiga, Riccardo v Onishi, Ken | 7-6,1-6,2-6 |
| ITF Hungary F3 | 2017/05/24 09:30 | Onishi, Ken v Borsos, Gabor | 1-6,1-6 |
| ITF Hungary F2 | 2017/05/17 08:00 | Onishi, Ken v Jotovski, Tomislav | 6-4,2-6,4-6 |
| ITF Hungary F2 | 2017/05/16 09:25 | Schmid, Michal v Onishi, Ken | 6-2,4-6,4-6 |
| ITF Hungary F1 | 2017/05/11 11:40 | Balazs, Attila v Onishi, Ken | 6-2,6-2 |
| ITF Hungary F1 | 2017/05/10 08:00 | Ovcharov, Alexander v Onishi, Ken | 1-6,3-6 |
| ITF Hungary F1 | 2017/05/08 08:00 | Onishi, Ken v Radinski, Aljaz | 6-3,7-5 |
| Challenger Caltanissetta Qual | 2017/06/10 14:05 | Molchanov, Denys v Ungur, Adrian | 6-2,6-4 |
| Challenger Vicenza Qual | 2017/05/28 14:35 | Blaz Rola v Ungur, Adrian | 6-3,6-1 |
| Challenger Vicenza Qual | 2017/05/27 13:40 | Barbosa, Romain v Ungur, Adrian | 2-6,4-6 |
| Challenger Mestre | 2017/05/23 12:45 | Ungur, Adrian v Viola, Matteo | 6-0,4-6,2-6 |
| Challenger Mestre Qual | 2017/05/22 10:00 | Mathias Bourgue v Ungur, Adrian | 0-6,1-6 |
| Challenger Mestre Qual | 2017/05/21 12:15 | Pavic, Ante v Ungur, Adrian | 6-7,3-6 |
| Challenger Mestre Qual | 2017/05/20 17:35 | Cagnina, Julien v Ungur, Adrian | 5-7,1-6 |
| Challenger Francavilla Qual | 2017/04/24 09:00 | Filip Krajinovic v Ungur, Adrian | 6-1,6-3 |